I bought the Sennheiser
PXC450's like i said i was going to. I've had them for a few weeks now and i absolutely love them. I'm hearing things in songs that i have never heard before. They are good at reducing back ground noise even when you don't have the noise canceling on. You can turn the PX450's noise canceling on and off. Which is a huge plus over the Bose Quiet Comforts, where noise canceling is always on, and you can't use the headphones at all if the proprietary rechargeable battery dies. I haven't tested the noise canceling in a suitable environment, but i will be taking an international flight at the end of this month. That will be the true test. They are extremely comfortably. They have very soft leather around the ears and on the band that rests on your head. All leather pads are washable and replaceable if needed. The audio cable is also replaceable, though i don't know how much it costs, still its nice knowing your 450 dollar headphones aren't useless if the cord get damaged. The construction seems very solid, nothing feels loose or flimsy. The only thing i could complain about is how expensive hey are. They retail for $450, which is what i paid. I have heard people suggest that Sennheiser jacked the price up on these to give people the impression that they are better and more luxurious then the Bose Quiet Comforts. In a lot of consumers minds high price means better quality (worked on me, although they are clearly much better then the overrated Bose headphones). If you can get past the price, these are sweet headphones that deliver tremendous sound quality with noise canceling when needed.